urea scr and dpf system for diesel sport utility vehicle ... · pdf fileurea scr and dpf...
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![Page 1: Urea SCR and DPF System for Diesel Sport Utility Vehicle ... · PDF fileUrea SCR and DPF System for Diesel Sport Utility Vehicle Meeting Tier 2 Bin 5 ... Final report for the completed](https://reader031.vdocuments.us/reader031/viewer/2022022421/5a82624c7f8b9a571e8e2845/html5/thumbnails/1.jpg)
1
DEER Conference – Sept 2, 2004
Urea SCR and DPF System for Diesel Sport Utility Vehicle Meeting Tier 2 Bin 5DOE and Ford Motor Company Advanced CIDI Emission Control
System Development Program(DE-FC26-01NT41103)
Diesel Engine Emission Reduction Conference
September 2, 2004
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DEER Conference – Sept 2, 2004
• Program Overview• Results with Fresh Catalyst System• System Durability• Exhaust Gas Sensor Development• Urea Infrastructure Study• Phase III• Conclusions
Presentation Overview
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DEER Conference – Sept 2, 2004
Urea SCR and DPF System for Diesel Sport Utility Vehicle Meeting
Tier 2 Bin 5
Program Overview
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DEER Conference – Sept 2, 2004
Phase I - Initial build/test phase (July 01-July 02)Establish baseline emission control systemDeliver engine dynamometer NOx and PM test resultsDeliver prototype vehicle NOx and PM test resultsDeliver urea delivery (infrastructure) prototype
Phase II - System/component optimization phase (July 02-July 04)Define final system hardware componentsDeliver NOx and PM performance data from fresh system
Phase III - Durability phase (July 04-July 05)Definition of durability test procedureFinal NOx and PM emission levels Final report for the completed program
Outline of Ford’s program to achieve Tier 2 FTP emissionstandards for 2007 using low sulfur diesel fuel as an enabler for a high efficiency aftertreatment system.
Primary Contractor
Subcontractors
Catalyst Suppliers
DOE Ultra-Clean Fuels Program
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DEER Conference – Sept 2, 2004
Concept Design• CFD Modeling including urea injection
Engine Dynamometer• Baseline and rapid warm-up testing• Urea SCR/CDPF optimization• Transient FTP testing
Emission Control System Durability• 120K miles on engine dyno
FEV Program
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DEER Conference – Sept 2, 2004
SCR Catalyst Development• Durable, high NOx conversion from 150° to 600°C
with low N2O make
Urea Infrastructure• Co-fueling concept• Cold-climate urea usage• Infrastructure studies
Fuel Development• Make and use fuel, which will be typical of 2007
production with 15 ppm sulfur cap
ExxonMobil Program
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DEER Conference – Sept 2, 2004
Diesel Fuel Properties
• ExxonMobil blended 14,000 gallon batch to represent typical 2007 ULSD
Est. Avg. Proposed Program Proposed‘06 Diesel DOE Program Fuel 2007
Fuel Property Properties Min/Max Delivered Cert. FuelSulfur, ppm 15* 10 / 15 12.5 7 / 15Density, kg/m3 850 820 / 850 841.1 839 / 865Aromatics, vol. % 32 25 / 32 29.5 27 minPolyaromatics, wt. % 10 6 / 11 11.0 no specCetane number 46 44 / 48 44.9 40 / 50T50, C 267 250 / 280 249 243 / 282T90, C 306 300 / 320 307 293 / 332
* As delivered to the vehicle
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DEER Conference – Sept 2, 2004
Urea SCR and DPF System for Diesel Sport Utility Vehicle Meeting
Tier 2 Bin 5
Results with Fresh Catalysts
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DEER Conference – Sept 2, 2004
LDT Exhaust System
urea
DOC
NOx sensor
SCR
DOCDOC
CDPF
Spray Target
to engine intake
• Engine-out NOx lowered by 40% with increased EGR• Low tailpipe NOx achieved with rapid warm-up strategy
• lower thermal mass upstream of catalyst system• engine calibration changes during cold start (post injection & inc. idle speed)
>90% FTP NOx conversion, 0.05 g/mi TP NOx
exhaustflow
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DEER Conference – Sept 2, 2004
FTP-75 Tailpipe Emissions and Conversions(with fresh catalysts on engine dyno)
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DEER Conference – Sept 2, 2004
Rapid Warm-up - Improvement
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DEER Conference – Sept 2, 2004
Rapid Warm-up - Improvement
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DEER Conference – Sept 2, 2004
System Durability
Urea SCR and DPF System for Diesel Sport Utility Vehicle Meeting
Tier 2 Bin 5
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DEER Conference – Sept 2, 2004
UreaInjector Air Inlet
Transfer Tube
Nozzle
ExhaustPipe
Clogging may occurdue to urea collection in mixing chamber.
Urea Dosing System: Previous Urea Injection System
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DEER Conference – Sept 2, 2004
With Integrated Metering Pump/Mixer
Air inletMixer
Metering Pump
All dead volume has beenremoved to avoid ureacollection and clogging.
Improved Urea Dosing System
to exhaust gas
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DEER Conference – Sept 2, 2004
• SCR activity was identical before and after regeneration
SCR Catalyst Durability: LDT CDPF Regeneration
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DEER Conference – Sept 2, 2004
• With 20% NO2/NOx feed, the catalyst is durable to 750°C
SCR Catalyst Durability: High Temperature
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DEER Conference – Sept 2, 2004
0102030405060708090
100
150 200 250 300 350 400 450 500 550 600Temperature (°C)
NO
x C
onve
rsio
n (%
)
4k mi SCR catalyst20h 700°C40h 700°C20h 725°C20h 750°C20h 800°C
SCR Thermal Durability with 80% NO2/NOx Feedgas
• With 80% NO2/NOx feed, the catalyst is durable to 800°C
30K h-1
NO2/NOx = 0.8NH3/NOx = 1
SCR Catalyst Durability:High Temperature
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DEER Conference – Sept 2, 2004
0
10
20
30
40
50
60
70
80
90
100
150 200 250 300 350 400 450 500 550 600 650Catalyst Temperature (°C)
NO
x co
nver
sion
(%)
degreened120k mi sulfatedafter regen at 650°C
SCR Catalyst Durability: Sulfur
• Sulfur poisoning is reversible after 650°C, lean
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DEER Conference – Sept 2, 2004
0
10
20
30
40
50
60
70
80
90
100N
Ox
Con
vers
ion
(%)
0
2
4
6
8
10
12
14
16
18
20
Cum
ulat
ive
HC
s (g
/l ca
taly
st)
% NOx Conv.Cum. HC's
DegreenedActivity(250°C,
20% NO2in feed)
Start HCAddition
500°C,10 min
ActivityRegained
End HCAddition
SCR Catalyst Durability: HC
• HC poisoning is reversible after 500°C, lean
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DEER Conference – Sept 2, 2004
Urea SCR and DPF System for Diesel Sport Utility Vehicle Meeting
Tier 2 Bin 5
Exhaust Gas Sensor Development
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DEER Conference – Sept 2, 2004
NOx:• Sensors used in monitoring both engine out and
tailpipe NOx levels
• Pre-production prototypes developed by a supplier with no major issues
• Production-intent sensors to be used for durability studies
NH3:• Used in monitoring NH3 slip
• Prototypes under development by a supplier
• To be included in durability studies
Emission Sensors
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DEER Conference – Sept 2, 2004
concentration (ppm)0 100 200 300 400
V
0.6
0.8
1.0
1.2
1.4
1.6
1.8
2.0
2.2
2.4
NH3
C3H6
NOCOC3H8
NO2
10% O2 and ~2% water
• Good NH3 sensitivity with little direct sensitivity to interfering gases such as CO, HC, NOx and O2
• Some sensitivity to H2O
Laboratory Data for Prototype NH3 Sensor
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DEER Conference – Sept 2, 2004
Urea SCR and DPF System for Diesel Sport Utility Vehicle Meeting
Tier 2 Bin 5
Urea Infrastructure Study
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DEER Conference – Sept 2, 2004
• Co-fueling hardware completed– Co-axial nozzle with fill-neck insert
provided by a major nozzle manufacturer
– Urea pumping system with flow meter
– Urea tank integral with dispenser – Urea heating system– 32.5 wt% urea in water assumed
Co-fueling Hardware Status
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DEER Conference – Sept 2, 2004
Plan:• Evaluate durability and reliability of a co-fueling system• Use F350 truck fitted with urea tank and modified filler neck• Drain fuel and urea tanks as necessary for subsequent refilling• Inspect fuel and urea samples for cross-contamination• Inspect interface parts for wear/damage
Results:• Urea flow measurement and shutoff operated as intended • Nozzle/insert seal showed intermittent leak of ~0.5% urea to fuel
Next Steps:• Supplier is improving nozzle and will supply test unit
Co-fueling Demonstration
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DEER Conference – Sept 2, 2004
Results• No suitable cold-temp additives identified• Cold room testing indicated heating system prevented freeze-
up and allowed urea refueling down to –20°F• Power measured at 0°F and –20°F• Cost: $4/day and $6/day ($0.11/kW-hr)
Recommendations• Heater system is feasible• Three heater system approach is anticipated for
urea heating in US:– no heaters for temperatures > 12°F– line heaters only for temperatures > 5°F– full heaters for temperatures to –20°F
Issues• Concerns over power outage and system
malfunction
1.5
2.3
0
0.5
1
1.5
2
2.5
kW
0 -20Deg. F
Power Consumption
Low Temperature Capability
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DEER Conference – Sept 2, 2004
Urea Infrastructure Economics
Background:• A study was conducted to evaluate the costs of delivering aqueous urea
to SCR vehicles at the service station.
Assumptions:• Vehicle fuel consumption, population and growth from DOE Energy
Information Administration's 2003 Annual Energy Outlook (AEO)• Vehicle distribution & mileage accumulation by vehicle age using EPA
MOBILE6• Urea use is 2% of vehicle diesel consumption• ROCE of 15% for service station investment, with a 3 year capital
recovery period• Projected urea costs are dependent on new heavy duty vehicles using
urea beginning in 2007
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DEER Conference – Sept 2, 2004
Co-fueled Urea Cost vs. Demand
1
10
100
10 100 1000
Urea Throughput Per Service Station, gals/month
Co-
fuel
ed U
rea
Cos
t, $/
gal During Capital Recovery
After Capital Recovery
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DEER Conference – Sept 2, 2004
Urea Infrastructure Economics –Study Findings
• Scenario 1: Introduction of Co-fueled Urea in 2007– Est. cost during capital payout period (2007-2010) is $42/gal.– In 2010, urea cost is expected to drop to approximately $3.76/gal.– Long-term cost is estimated to be $2/gal, due to projected increase in urea SCR
vehicles
• Scenario 2: Introduction of Bottled Urea in 2007 and Co-fueled Urea in 2010
– Est. cost of bottled urea to the retail location is $3.66/gal.– Est. cost of co-fueled urea introduced in 2010 is $18/gal.– Co-fueled urea could cost the same as bottled urea if LDD vehicle volume is much
higher than expected (8% of total LD volume vs <1%).
• Scenario 3: Introduction of Bottled Urea in 2007 and Co-Fueled Urea Phase-in Starting 2010
– Introduce co-fueling at only the highest throughput stations (<1% of stations).– Long-term co-fueled urea cost estimated to be $1.50/gal.– The switch from bottled urea to co-fueling would depend on the economics of
individual service stations.
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DEER Conference – Sept 2, 2004
Urea Infrastructure Economics –Conclusions
• The cost to develop an infrastructure for delivery of aqueous urea to light-duty diesel vehicles is much less expensive using bottled urea, as wide-scale introduction of co-fueling is very costly.
• Co-fueling costs would be lowest if installations are phased-in gradually at the highest throughput stations, starting in 2010.
• The long-term price of co-fueled aqueous urea under such a scenario is expected to be $1.50 to $2 per gallon.
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DEER Conference – Sept 2, 2004
Urea SCR and DPF System for Diesel Sport Utility Vehicle Meeting
Tier 2 Bin 5
Phase III
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DEER Conference – Sept 2, 2004
Task 3.1 Urea Infrastructure Development (EM)
Task 3.2 Durability Testing3.2.1 Durability Test Definition3.2.2 Installation of Final ECS on Vehicle & Dyno3.2.3 ECS Durability Testing3.2.4 Catalyst and Control Support3.2.5 Low Sulfur Fuel Support
Task 3.3 Post Durability Evaluation
Task 3.4 Final Report Preparation
Phase III Timing Plan
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DEER Conference – Sept 2, 2004
Durability Test Definition
0
10
20
30
40
50
60
70
80
90
0 250 500 750 1000 1250 1500time (s)
vehi
cle
spee
d (m
ph)
Ford High Speed Cycle (HSC)
• average speed = 47 mph
• max speed = 75 mph
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DEER Conference – Sept 2, 2004
Durability Testing Schedule
0
20000
40000
60000
80000
100000
120000
8/1/04
9/1/04
10/1/
0411
/1/04
12/1/
04
1/1/05
2/1/05
3/1/05
4/1/05
5/1/05
6/1/05
Date
Mile
age
Dyno hrs/wk =Aging interval (mi) =
8020000
0
20000
40000
60000
80000
100000
120000
8/1/04
9/1/04
10/1/
0411
/1/04
12/1/
04
1/1/05
2/1/05
3/1/05
4/1/05
5/1/05
6/1/05
Date
Mile
age
Dyno hrs/wk =Aging interval (mi) =
8020000
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DEER Conference – Sept 2, 2004
Conclusions• The objective of 0.07 g/mi NOx and 0.01 g/mi PM on the FTP was
met with a fresh emission control system of Urea SCR and CDPF.• System improvements included lower engine-out NOx and rapid
system warm-up.• Improvements were made to the urea dosing system.• The SCR catalyst could withstand the temperatures associated
with CDPF regeneration that also remove poisons (HC, S).• Pre-production NOx and prototype NH3 sensors were successfully
tested.• Co-fueling hardware was successfully demonstrated under cold
conditions and potential nozzle durability issue was discovered.• The cost of aqueous urea for LDD vehicles is minimized when
bottled urea is used initially and co-fueling is phased in gradually.
• The project proceeded into Phase III (Durability Testing).
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DEER Conference – Sept 2, 2004
FordBrendan Carberry, Dick Chase, Jennifer Fischer, Bob Hammerle, Dave Kubinski, Paul Laing, Christine Lambert, Mike Levin, DoinaMagda, Rick Soltis, Devesh Upadhyay, Michiel van Nieuwstadt, Gary Stokes, James Warner, Scott Williams, George Wu
FEVErik Koehler, Dean Tomazic
Exxon MobilJoan Axelrod, Rich Grosser, Marcus Moore, Mike Noorman, Charlie Schleyer
Acknowledgements
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DEER Conference – Sept 2, 2004
Backup Slides on Urea Economics
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DEER Conference – Sept 2, 2004
Details of Capital Cost for Co-fueling
• Dispenser supplier, nozzle supplier, and EM Fuels Marketing assisted with cost estimates for a complete co-fueled system.
Item Est. Cost ($)
Dispenser, dual hose (basic) 6,000 Urea pumping system with heaters 4,500 Urea tank (140 gallon) with heaters 3,500 Hoses, nozzles, electronic level/signal 3,000 Freight and taxes (8%), utilities upgrade 3,500 Installation and startup 3,500 Administrative costs (permitting, ~10%) 2,500 Total 26,500
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• Annual operating expense estimated from EM experience and additional urea system requirements.
• Cost shown assumes full heating for coldest climate use.
Details of Co-fueling Operating Expense
Item Est. Cost ($/yr)
Maintenance 1,100 Property taxes (2% of capital) 220 Utilities 457 Total 1,777
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Details of Bottled Aqueous Urea Cost
Item Est. Cost ($/gal)
Manufacture + Distribution 0.60 Bottling 2.11 Delivery 0.95 Total 3.66
• Estimated costs for bottled urea as delivered to the retail location.